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CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Cash flows from operating activities: |  |
Net earnings | $ 44,457 | $ 32,666
Adjustments to reconcile net earnings to net cash provided by operations: |  |
Depreciation and amortization | 55,223 | 54,218
Provision for deferred income taxes | 12,490 | 8,846
Amortization of unearned share-based compensation | 4,900 | 7,551
Amortization of leases | 446 | 0
Amortization of major maintenance costs | 4,974 | 4,893
Amortization of debt issuance costs | 320 | 259
Other | (2,544) | (1,773)
Decrease in cash flows resulting from changes in operating assets and liabilities, net | (81,737) | (87,926)
Net cash provided by operating activities | 38,529 | 18,734
Cash flows from investing activities: |  |
Capital expenditures | (60,932) | (40,961)
Acquisitions of businesses and marine equipment, net of cash acquired | (247,470) | (429,977)
Proceeds from disposition of assets | 13,187 | 12,181
Net cash used in investing activities | (295,215) | (458,757)
Cash flows from financing activities: |  |
Payments on bank credit facilities | (240,801) | (64,414)
Borrowings on long-term debt | 500,000 | 499,295
Payments of debt issue costs | (2,232) | (4,251)
Proceeds from exercise of stock options | 1,415 | 292
Payments related to tax withholding for share-based compensation | (2,003) | (3,766)
Other | (204) | (225)
Net cash provided by financing activities | 256,175 | 426,931
Decrease in cash and cash equivalents | (511) | (13,092)
Cash and cash equivalents, beginning of year | 7,800 | 20,102
Cash and cash equivalents, end of period | 7,289 | 7,010
Cash paid (received) during the period: |  |
Interest paid | 23,257 | 10,763
Income taxes refunded | (1,024) | (721)
Operating cash outflow from operating leases | 10,142 | 0
Capital expenditures included in accounts payable | (5,022) | (5,448)
Non-cash investing activity: |  |
Cash acquired in acquisition | 0 | 2,313
Right-of-use assets obtained in exchange for lease obligations | $ 1,292 | $ 0

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